Yeah every time I see a series with a foreigner majn heroine I just expect a typical Japanese girl with blonde or platinum hair.
It's funny how at first there's whingeing among the probably not Nordic readers about the too fast pacing, and now about foreigners depicted as Japanese.
My reaction is mostly the opposite.
In the Nordics, Finns are seen as the straightest shooters, and if you ask the Finns the toughest ones, too.
So when there's talk of tsundere and fast pace, I just see a Finnish girl being direct and up front. And of course everyone isn't the same, but boy are some readers' reactions colored by their preconceptions (mine too, obviously).
That said,
I was annoyed by the maiden in distress scene in the cafe. That's where a Finnish girl might have disposed of some non-sisu Japanese wannabe tough male babies.
But the mangaka wanted the trope, and all Finnish girls aren't tough all the time.